Brake-shoe with corrugated and perforated insert.



H. JONES. BRAKE SHOE WITH CORRUGATED AND PERFORATED INSERT.

APPLICATION FILED FEB. 10,1911.

Patented June 13, 1911.

"a. f do I sTATns PATENT onnrcn.

nennr nouns, or surrnniv, NEW YORK, assrcuon To EDWARD H. minnows, or new i YORK, N. Y.

BRAKE-SHOE WITH CORRUGATED AND PERFORATED INSERT.

acacia Specification of Letters Patent. Patented June 13, 1911.

Application filed February 10, 1911. Serial No. 607,728.

State of New York, have made and invent ed certain new and useful Improvements in Brake..,--Shoes with'Gorrugated and Perforated inserts, of which the following is a specification.

My invention relates to brake shoes of the type haying a metallic insert of Wrought metal, such as mild steel, embedded in the cast metal body portion of the shoe, and which insert is worn away simultaneously with the body portion as the shoe is used; and the objects thereof are to provide a brake shoe in which the insert will contribute materially to the strength of the shoe; to provide a brake shoe in which the cast metal body portion will be held together as a unitary structure should it become cracked or broken in use; to provide a brake shoe in which there is no waste of material in the formation of the insert; to provide a brake shoe in which the insert and 'body portion are more firmly joined together as the cast metal body portion is poured about the insert; to provide a brake shoe in which the disposition of the cast metalof the body portion and the wrought metal of the insert inthe wearing face of the shoe is continuously changing as the shoe is worn away in use,

so that the formation of grooves in the periphery of the car wheel with which the shoe is used will be avoided, and to provide such other improvements in and relating to brake shoes of the type referred to as are hereinafter disclosed; all as illustrated in the accompanying drawing, described in the following specification and particularly cllaimed in the clauses of the concluding c aim.

In the drawing accompanying andforming the shoe as seen from a position in front of its wearingitgce; Fig. 3 is a view showing a section upon a transverse plane indicated by the line 3-3., Fig. 1, and'Fig. 4 is a view showing the back of the shoe.

In the drawing, 7 represents the wrought metal insert of my improved brake shoe.

This insert is formed from a rectangular plate of metal such as mild steel the plate being corrugated as shown in Fig. 3 to provide comparatively deep groovcs8 extending longitudinally of and throughout the length of the insert, the insert being bent or curved longitudinally so as to correspond,

approximately, with the curvature of the can wheel with which t shoe is to be used. The sides ofthe insert 7 are crimped as shown at 9 whereby undulating edges of the insert are produced, the crimping being preferably accomplished at the same time that the, insert is curved longitudinally, although the edges may be crimped at a separate operation.

The insert 7 is provided with longitudinally extending series of holes 10 preferably spaced uniformly along the bottonr walls of said corrugations or grooves 8, said holes being preferably formed by punching, in which case the punch is forced through the insert from the bottom wall or concave surface of the grooves, so that the material of the insert is displaced or forced outward from the convex surface of the grooves or corrugations, the form of the punch being such that the material of the insert is displaced and formed into a bur 14, and not completely and cleanly cut out as is usual in punching processes.

The term bottom wall is used, as will be understood, with reference to the position. in whichthe corrugated insert is supported when the holes are being punched, the punch being always driven from the concave surface of the corrugations, and the insert so supported that such surface becomes the bottom wall of the corrugation.

The body portion of the shoe is indicated by the reference character 11, and the metallic insert 7 is located adjacent the front or wearing face of the shoe, as shown, so

that the body portion of the shoe and thebeing thus securely bound together, both because of the form or shape of the insert, and by the metal of the body portion which extends through the holes 10. The cast metal body portion and the insert wear away simultaneously as the shoe is used, and the form of the insert is such that it contacts with different portions of the car wheel as the shoe is worn, whereby the formation of grooves in the ear wheel is avoided.

In practice my improved brake shoe will be formed with a wrought metal back stiiiening member 12, and with a securing lug 13, both embedded in the cast metal body portion of the shoe, said elements being placed in the mold with the insert before the body portion is formed. These elements, however, form no part of the invention disclosed and claimed in this present application.

Itwill be understood that the longitudinally extending and comparatively deep grooves or corrugations impart great strength to the insert as compared with the amount of metal contained therein, whereby it follows that the shoe, in which the insert is embedded, is materially strengthened. Furthermore, the insert being of considerable volume at all points is not seriously burned by the fluid metal as it comes into contact therewith, asource of weakness in a wherein the insert are finely divided.

Ilaving thus described my invention, I claim and desire to secure by Letters Patent:

; 1. In a brake shoe of the class described, a cast metal body portion, and a wrought metal insert embedded in said body portion,

and-located adjacent the wearing face of the shoe so as to be worn away simultaneously with the body portion said insert extending longitudinally of the shoe and being corrugated, the corrugations extending longitudh shoe and being corrugated, the corrugations v, extending longitudinally of the insert, and the sides of said insert being crimped to provide undulating edges.

3. In a brake shoe of the class described, a cast metal body portion, and a wrought metal insert embedded in saidbody portion, said insert extending longitudinally of the shoe and being corrugated, the corrugationsextending longitudinally of the insert, the latter having a series of holes spaced apart and located in the bottom walls of said corrugations.

4. In a brake shoe of the class described, a cast metal body portion, and a wrought metal insert embeddcd'therein, said insert extending longitudinally of the shoe and being longitudinally corrugated, having a series of holes spaced apart and located in the bottom walls of said corrugations, said holes being punched from the concave surface of the bottom walls of said corrugations whereby a bur is formed upon the convex surface of said bottom walls.

In a brake shoe of the class described, a cast metal body portion, and a wrought metal insert embedded therein, said insert extending longitudinally of the shoe and being corrugated, the corrugations extending longitudinally of the insert and the sides ol said insert crimped to provide undulating edges, said insert having. a series of holes spaced apart and located in the bottom walls of said corrugations.

(3. In a brake shoe of the class described, a crst metal body portion, and a wrought metal insert embedded therein, said insert extending longitudinally of the shoe and being corrugated, the corrugations extending -longitudinally of the insert, and the sides being (:rimped to provide undulating edges, said insert having a series of holes spaced apart and located in the bottom walls of said corrugations, said holes being punched from the concave surface of the bottom walls of said corrugations whereby a bur is formed upon the convex surface of said bottom walls.

Signed at Suitcrn in the county of Rockland and State of New York this seventh day of February A. D. 1911.

' HARRY JONES. \V i tnesses J. A. DAVIDSON, E. M. MALOY. 

